import { ContextManager, Observable } from '@zcomponent/core';
import { Group } from '../Group';
interface ConstructorProps {
    /**
     * The radius of the breadcrumb base.
     *
     * @zprop
     * @zdefault 0.05
     */
    radius: number;
    /**
     * The radius of the breadcrumb outline.
     *
     * @zprop
     * @zdefault 0.07
     */
    outlineRadius: number;
    /**
     * The maximum number of breadcrumbs to display.
     *
     * @zprop
     * @zdefault 500
     */
    maxCrumbs: number;
}
/**
 * A component that displays breadcrumbs along a curve.
 *
 * You may either set the `curve` property to a Curve3 node, add a Curve3 node as a child, or set the `path` property to an array of points.
 *
 * @zcomponent
 * @zgroup Navigation
 * @zicon assistant_navigation
 * @ztag three/CurveHost/Breadcrumbs
 */
export declare class Breadcrumbs extends Group {
    constructorProps: ConstructorProps;
    private _baseMaterial;
    private _outlineMaterial;
    private _shadowMaterial;
    private _baseMesh;
    private _outlineMesh;
    private _shadowMesh;
    private _curve;
    private _curveComponent;
    private _generatedPath;
    constructor(contextManager: ContextManager, constructorProps: ConstructorProps);
    private _updateCurve;
    private _updatePath;
    private _updateAlongPath;
    _updateHeight: () => void;
    /**
     * The path to follow. This is used if no Curve3 is set via the `curve` property or as a child.
     * @zui
     */
    path: Observable<[x: number, y: number, z: number][], never>;
    /**
     * The curve to follow.
     *
     * @zui
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zvalues nodeids three/Curve3/**
     */
    curve: Observable<string | undefined, never>;
    /**
     * The gap between breadcrumbs, in world units.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @zdefault 0.3
     */
    gap: Observable<number, never>;
    /**
     * The color of the breadcrumb base.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @ztype color-hex
     * @zdefault #000000
     */
    baseColor: Observable<string, never>;
    /**
     * The color of the breadcrumb outline.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @ztype color-hex
     * @zdefault #ffffff
     */
    outlineColor: Observable<string, never>;
    /**
     * The height above the ground to place the breadcrumbs.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @zdefault 0.05
     */
    height: Observable<number, never>;
    /**
     * Whether to align the breadcrumbs with the slope of the curve.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @zdefault true
     */
    alignWithSlope: Observable<boolean, never>;
    /**
     * Whether to update the breadcrumbs every frame. This is useful if the curve's transform is changing often, but has a performance cost.
     *
     * @zgroup Breadcrumbs
     * @zgrouppriority 50
     * @zprop
     * @zdefault false
     */
    updateEveryFrame: Observable<boolean, never>;
}
export {};